Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
Bacligro~d oL the InvLntion .1~55 ~S
The present invention relates to a device for orien~
a mass consisting of wood cllips, f~akes, slivers and fibers in a
preferred direction during the production of particleboard.
Vertical guide surEaces are arrallged in si~e-by-side fashion and
spaced from one another. Above the guide surfaces, spaced apart
horizontal rotating shafts are provided. Spacer rings and pin
plates are arranged on the shafts.
A device for thc orientation of wood chips and the like
during the production oE particleboard is known fro~. DE-OS
30 18 683. Orientation of chips in a preferred direction is
achieved in that above the guide surfaces an assembly of spacer
rings, solid plates, and pin plates are arranged on rotating
shafts. A device of this nature makes it poss;ble to catch the
chips falling onto the rotating shafts, namely ~y means of che pin
plates and to guide these chips into discharg~ -dllltes deEined by
guide p].ates. This is accomplished by means ~ the solid plates,
which, contrary to the pin plates, have varyit diameters. Such
an orienting process is difficult in those cases where great wood
chip masses pass through the device, since the material to be
oriented may enter and accumulate between the pin plates and the
solid plates thereby causing a decrease of the passage cross
sectLon at the guide plates and blockage. Also it is possible
that the pins of the pin plates, due to material falling between
the solid plates and pin plates, are bent so far from the solid
plates that they touch the edges of the guide plates when the
shafts rotate. This may cause the pins to be torn off. Such a
tearing may also cause the beginning of a blockage, since the pins
of the pin plates no longer can direct the chip material - which
partially lies cross-wise over the guide plates - into the chutes
between the guide plates. In this case, the solid plates uith
various diameters are not sufficient to redirect a turned-arolu~d
chip into a longitudinal orienta~ion.
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~ h the above as baci;ground, the purpos~ of Lhe
invention is to guarantee orientation of wood chips and the lii;c
to be discharged into a preferred direction, without congestion
between the guide plates and without tearing the pins of the pin
rollers. This problem is solved by the connection, according to
the invention, of all pins with a self-contained closed ring in
the same plane as the pins. An open plate arrangement is achieved,
whereby the wood chips to be discharged, which are influenced by
the pin ends, can also pass through the open plate behind the
ring. Thus, there is no additional rotating wall between the
individual orientation grids, which wall could cause a congestion
in the orientation grid if the flow of chips is heavy, and there
is also no danger that the pins are bent away from a plate.
Movement of extremely long chips is accomplished by
tipping tlle chips perpendicularly to the feed direction and
accelerating the chips through the pins in the discharge direciion.
According to the invention, additional spacer plates,
which form a very narrow grid, but due to the opraings be~ween the
plate foot and the plaite ring, it is very easy t~ achieve thAt
even long pieces can be discharged as small chips througil the
narrow grids, since they.can pass without difficu;ty through the
free space between the plate foot and the plate ring.
Elliptical rings of the pin plates make it possible to
cover a m~jor portion of the horizontally arranged pin rollers
and thus to decrease problem areas between the individual pin
rollers and the guide plates.
The pins extend beyond the elliptical rings to produce
a circular path. Also, proper orientation of individual chips is
achieved by a variety of pin plate placements on the rotating
shafts. When four pins per pin plate are provided, each adjacent
plate is oriented 45 in the rotational direction of the shaft.
Uowever, according to the invention, it is possible to varv the
index angles and the number of pins as desired.
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To support the orientation, particularly of long chips,
different distances between the upper edges of the vertical guide
plates and the horizontal shafts are provided. This will
slgnificantly facilitate the turning of chips lying cross-wlse
to the desired orientation without breaklng these chips.
Such devices according to the invention are combined
into scatter heads and used in the production of wood material
boards with oriented individual chips. For large through-put
quantities, several of these scatter heads are arranged in series.
Brief Description of the Drawing
Novel features and advantages of the present invention
in addition to those mentioned above will become apparent to those
skllled in the art from a reading of the following detailed
description in conjunction with the accompanying drawing wherein
similar reference characters refer to similar parts and in which:
Figure lA is a side elevational view of a pin plate
with a circular ring, according to the present inventioni
Figure lB is a side elevational view of a pin plate
with an elliptical ring, according to the present invention;
Figure 2A is a top plan view of a pin roller comprising
a combination of several pin plates on one sha~t, according to
the present invention;
Figure 2B is a top plan view similar to Figure 2A
illustrating another pin roller arrangement; and
Figure 3 is a side elevational schematic view of a chip
orientation device, according to the present invention.
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Detalled Description of the Invention
Referring in more particularity to the drawing, a pin
plate 1 has a hub portion 2, in which there is a star-shaped
opening 3. This star-shaped opening serves to slide the pin plate
1 onto a polyhedral shaft 4 (cf. Figure 2). Due to the star-
shaped opening 3, the individual pin plates can be indexed in the
axial direction of the polyhedral shaft at arbitrary angles to one
another in the rotational direction. As shown in Figure lA, a
circular ring 5 is positioned near the outside peri.phery of pin
plate 1, and four equally spaced apart ribs 6 radiate from hub 3
to ring 5. If, between the hub portion 2 and the closed ring 5,
there are no more than four ribs 6 on which the pins 7, 7a are
located outside of the ring in the same radial direction, a
spiral-shaped arrangement of the ribs 6 and the pins 7, 7a may be
achieved over the axial length of the polyhedral shaft. Such
spiral arrangement occurs if each subsequent pin plate is indexed
by 45, as shown best in Figure 2B. This spiral-shaped progres-
sion of the ribs 6 and the spiral-shaped progression of the pins 7,
7a additionally supports the oriented discharge of the wood
chips, as explained more fully below. A device of this nature is
preferred in the production of OSB boards (orie:~ed strand board).
The pins 7 comprise extensions of the ribs 6 and have
the same dimensions as ribs 6. Pins 7a have similar dimensions,
but in the circumferential direction, they are wider than the ribs
6. According to the invention, the result of such an execution is
that larger chips are also affected by the corresponding impulse
and can be oriented into a preferred direction.
From Figure lA it can further be seen that ausiliary
ribs 8 may be provided between the hub portion 2 and the closed
ring 5. These auxiliary ribs 8 serve to stiEfen the pin plate 1
and simultaneously to support the orientation of chips. If these
auxiliary ribs 8 are extended beyond the closed ring, the result
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is pin plates with six pins, for example, which in certain cases
facilitate the orientation of chips.
The star-shaped opening 3 is not fixed to the arrange-
ment represented in Figure lA, lB, but other star-shaped openings
can also be applied, so that a pin plate with eight pins, for
example, may be indexed at a specific angle in ~'he circumferential
direction from plate to plate so that a spiral-shaped arrangement
of the pins 7 and 7a and the ribs 6 as well as the auxiliary
ribs 8 is possible on the polyhedral shaft with this arrangement
of the pin plates. It is also possible to provide the pin plates
1 only with pins 7 or only with pins 7a or, as shown, with an
arrangement which combines pins 7 and pins 7a.
As can further be seen from Figure lA, the pin plates 1
may also have individual segments 9, which are limited on one side
by edges 10 and on the other hand by ribs 6.
Thus, in the manufacturing of OSB boards, pin plates 1
may be used which consist oE ribs 6 and pins 7, a hub portion 2,
a star-shaped opening 3 and a closed ring 5, as well as pin plates
1, where, in addition to the ribs 6, there are segments 9 between
the hub portion 2 and the closed ring 5. Pln plates 1 may be
used which have only segments 9 between the hub portion 2 and the
closed ring 5 and in radial direction, in addition to the closed
rings 5, pins 7 and pins 7a, or only pins 7, or only pins 7a~ It
is also possible to make pin plates 1, in which auxiliary ribs 8
are provided between the hub portion 2 and the closed ring 5 in
addition to the ribs 6 or the segments 9.
Figure lB shows a pin plate 1, where a~ elliptical
ring 33 encloses the hub portion 2 with the star-shaped opening 3.
Auxiliary ribs 8 and ribs 6 extend inside the elliptical ring 33.
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Rib extensions 34, 35 connect to tlle ribs 6 outside of the
elliptical ring along the minor axis of the ellipse while rib
extensions 36, 37 connect to the ribs 6 outside the elliptical
ring 33 along the major axis of the ellipse. Rib extensions 34,
35 are dimensioned lengthwise in such a manner that they have the
same tip location as rib extensions 36, 37. The radial distance
from the center of rotation to the outer tip ends of each
extension is the same. In the example of Figure 1~, the rib
extensions 34, 35 are each provided with a reinforcement 38 due
to their greater length as compared to the rib extensions 36, 37.
The pin roller shown in Figure 2A consists of a number
of pin plates 1, which are arranged at distances from one another
on the polyhedral shaft 4 by means of spacer ri ~,s 11. These
pin rollers 12 extend over the entire width of .he chip material
to be produced, so that a continuous wood materi.al, i.e. a material
with oriented chips, can be produced. The pin rollers 12 may be
associated with vertical ~uide surfaces 13 located below the
rollers and through which the oriented chips are loaded onto a
discharge base 14, as shown best in Figures 2A and 3.
As can be seen from Figure 2A, the pin plates 1 have
the same movement diameter 15, but the diameters of the closed
rings 5 vary. This means that the individual pins 7 or 7a extend
to different distances beyond the closed ring 5. By means of this
relationship of different diameters of the closed rings 5, it is
achieved that even long chips assume a specific slide-by angle to
the axis of the polyhedral shaft 4 and thus arrive oriented
between the individual guide surfaces for deposition onto the
discharge base 14.
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Basically as a result of the space between the hub
portion 2 and the closed ring 5 of the open pin plate 1, the pin
plate itself does not constitute a resistance surface which could
cause congestion of non-oriented chips and in turn blocking of
the chutes 16 between the guide surfaces 13. Due to the sequence
of spacer rings 11 and pin plates 1 of the same thickness, the
rotating grid of pin plates 1 and consequently of pin rollers 12
can be selected so narrowly that no chip falls on the spacer
rings 11 without being oriented, This assures that no chip will
be deposited o,n the discharge base 14 without first being
properly oriented,
Figure 3 illustrates the arrangement of pin plates 1,
each having only four ribs 6, and indexed on the shaft 4 so that
each plate is offset from an adjacent plate by 4~. This produces
an outside spiral or helical pattern of pins 7 and 7a. Otherwise
the arrangements of Figures 2A and 2B are the same.
The orientation device shown in Figure 3 is fed with
material to be oriented, namely via an opening 17, This material
has previously been broken up by means of preliminary break-up
rollers 19 which are located in a housing 20, The orientation
device extends over the entire width of the discharge base 14 and
in the direction of arrows 21, 22, the not yet oriented material
is fed to pin rollers 12 consisting of pin plates 1 and spacer
rings 11 on polyhedral shafts, The pin rollers 12 also rest on
left and right bearings (not shown) positioned in the housing 20
and extend over the entire width of the discharge base. As shown
in Figure 3, two pin rollers 12 rotate clockwise, while one pin
roller 12 rotates counterclockwise~ The purpose is that the pre-
broken chip material coming from the breaking rollers 12 is
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Lransported and oriented through the guide surf~ces 13 expressly
by means of the pin rollers 12. Thus, chip material which has not
been oriented cannot fall onto the guide surfaces 13 behind the
last pin roller 12, as shown by the double arrow 23, where it
could cause congestion.
The guide surfaces 13 have upper edges 30, 31, whereby
the upper edge 31 has a greater distance to the axes 32 of the pin
rollers 12 than the upper edge 30. The lower edges of the guide
surfaces 13 are not displaced in respect to one another.
According to the invention, the outermost guide surfaces
13 have upper edges 30, while the guide surfaces 13 arranged
between these entry surfaces have alternatingly upper edges 30
and 31, i.e. different distances to the axes 32.
Limit flaps 24, 25 additionally screen the area above
the pin rollers 12 so that the pre-broken chip material 21, 22 is
transported through the chutes 16 between the guide surfaces 13
in the area of the pin rollers. After leaving the guide surfaces
13, the oriented chip material is deposed as a mat of wood
material 26 onto a discharge base 14.
The guide surfaces 13 are.connected with the housing 20
of the orientation device by means of screw connections 28 and 29.
The different distances.of the upper edges of the guide surfaces
13 in itself facilitates a tipping of extremely long chips into
the individual chutes. In addition, and in combination with the
pin rollers 12, it facilitates the discharge of chip material to
be oriented.
